Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/GenKryptik.GCJX Data Exfiltration Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/gate.php?namelog="; startswith; fast_pattern; http.content_type; content:"multipart/form-data|3b 20|boundary|3d|"; pcre:"/^(?:\x2d){21}[a-f0-9]{15}/R"; http.request_body; content:"|2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d|"; startswith; pcre:"/^[a-f0-9]{15}/R"; content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|"; distance:0; content:"|0d 0a|Content-Type|3a 20|application/octet-stream"; distance:0; content:"|0d 0a 0d 0a|PK"; distance:0; content:"Processes.txt"; content:"Screenshot.jpg"; content:"Software.txt"; Content:"UserInformation.txt"; content:"Windows.txt"; reference:md5,06c4268136192ad2d04af2c91c4be522; classtype:trojan-activity; sid:2044432; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_03_02, deployment Perimeter, malware_family Win32_GenKryptik_GCJX, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_02;)